Oracle Cloud Infrastructure Documentation

iSCSI Commands and Information

Block volumes attached with the iSCSI attachment type use the A TCP/IP based standard used for communication between a volume and attached instance. protocol to connect a volume to an instance. See Volume Attachment Types for more information about volume attachment options.

Once the volume is Link a volume and instance together. Allows an instance to connect and mount the volume as a hard drive., you need to log on to the instance and use the iscsiadm command-line tool to configure the iSCSI connection. After you configure the volume, you can mount it and use it like a normal hard drive.

To enhance security, Oracle enforces an iSCSI security protocol called Stands for Challenge-Handshake-Authentication-Protocol. It is a security protocol used by iSCSI for authentication between a volume and an instance. that provides authentication between the instance and volume.

Accessing a Volume's iSCSI Information

When you successfully attach a volume to an instance, Block Volume provides a list of iSCSI information. You need the following information from the list when you Make an attached volume usable by an instance's guest OS. the instance to the volume.

  • IP address
  • Port
  • CHAP user name and password (if enabled)
  • IQN


The CHAP credentials are auto-generated by the system and cannot be changed. They are also unique to their assigned volume/instance pair and cannot be used to authenticated another volume/instance pair.

The Console provides this information on the details page of the volume's attached instance. Click the Actions icon (three dots) on your volume's row, and then click iSCSI Information. The system also returns this information when the AttachVolume API operation completes successfully. You can re-run the operation with the same parameter values to review the information.

See Attaching a Volume and Connecting to a Volume for step-by-step instructions.

Additional Reading

There is a wealth of information on the internet about iSCSI and CHAP. If you need more information on these topics, try the following pages: